Why Does My Computer Say Non-system Disk or Disk Error

So, when I booted up my computer today, it came up with an error saying, 'Non-system disk or disk error.' What should I do to fix the startup issue and access my Windows desktop? Can someone help me with this? Thanks in advance!

Best Answered by

Oliver· Answered on Apr 18, 2024

There are many possible factors why you receive the message saying non-system disk or disk error and are unable to boot up the PC:

  • Faulty cable for HDD and motherboard
  • Misconfiguration of boot media
  • Bad sectors
  • Corrupted master boot record
  • Inactive system partition

Now you know the possible reasons behind the issue, let's learn how to fix it. First, you may want to clone the damaged drive to another to back up data on it. EaseUS Partition Master Professional can help you to manage that.

Free Download 

Windows 11/10/8/7100% Secure

After the backup, check the solutions below to repair your disk:

Solution 1. Check Peripherals

Go and check if your HDD's IDE or SATA cables are connected properly and if removing certain storage devices can resolve the problem. 

Solution 2. Check Boot Priority in BIOS/UEFI

Step 1. Press BIOS hotkeys (Usually Esc, F2, F8, F10) while rebooting to enter the BIOS or UEFI setup screen.

Step 2. In BIOS, go to the Boot tab and set your system drive as the boot priority. In UEFI, you can use the mouse pointer to change the boot drive. (The UEFI interfaces vary in different computer manufacturers and firmware versions.)

Step 3. Save and exit.

Solution 3. Rebuild MBR

The reliable and powerful tool mentioned above also has the ability to repair MBR and is able to fix many other common errors in your system.

Step 1. Create a WinPE bootable disk with EaseUS Partition Master's "Bootable Media" feature

Step 2. Connect the bootable USB to your PC, enter the BIOS, and set the PC to boot from your USB drive.

Step 3. Launch EaseUS Partition Master and click "Toolkit" > "Rebuild MBR."

Step 4. Select the target disk and MBR type, then click "Rebuild" to start.

Free Download 

Windows 11/10/8/7100% Secure

People Also Ask

MBR2GPT Cannot Find Room for the EFI System Partition Error, How to Fix?

You may meet the 'cannot find room for the EFI system partition' error when you upgrade legacy BIOS to UEFI using the MBR2GPT utility.


Jun 20, 2024

Windows Server Cannot Boot From USB, How to Fix

If you meet the 'no boot media' error on your computer, don't worry. This short passage will help you find out the reasons quickly. And you will get the most efficient solution to fix Windows Server that cannot boot from USB.


Apr 22, 2024

Why My Cloned SSD Not Detected on Windows 10 and How Can I Fix the Boot Issue

Can your cloned SSD or cloned hard drive boot smoothly? This short page focuses on the cloned SSD not detected issue and helps explain the reasons behind the issue.


Apr 18, 2024

A Disk Read Error Occurred, How to Fix?

Your computer unexpectedly freezes while you're using it, requiring a hard restart. You might get the message saying, 'A disk read error occurred', and are advised to restart Windows by pressing Ctrl+Alt+Del. However, most of the time, it won't work. Read this article to learn how to resolve this.


Apr 22, 2024

Why Do I Get a Boot Error Message When I Start My Computer

Why do I get a boot error message when I start my computer? What does the information mean? Continue reading on this page. It covers everything you need to know, including the solution.


May 11, 2024

How Do I Convert MBR to GPT on HP Laptop

Due to the popularity of Windows 11, many HP users need to convert their MBR disks to GPT disks in order to allow the system to function properly. But some users ask, how do I convert MBR to GPT on HP laptop? Continue reading this page to learn more information.


Jan 25, 2024